ORLANDO, Florida (CNN) -- For the second time in 15 days, a Florida woman suspected in the disappearance of her 3-year-old daughter walked out of jail, this time after somebody anonymously posted the $500,000 bond.

Casey Anthony is released Friday from Florida's Orange County Jail for the second time in about two weeks.

Wearing the same "Where Is Caylee?" T-shirt she had on when she was arrested, Casey Anthony was released from the Orange County Jail at 10:09 a.m. ET, officials said.

She kept her head down and said nothing as attorney Jose Baez and two burly bodyguards dressed in black escorted her through a gathering crowd and into Dodge Durango that then sped away.

Television news helicopters followed the sport utility vehicle during the short drive to the home of Anthony's parents. Watch the mob scene »

The SUV, its windows darkly tinted, nosed past a crowd of about 30 people and into the garage. Some carried signs supporting Anthony. Others had signs condemning her. The garage door closed, keeping Anthony out of sight of cameras and gawkers alike.

Anthony is confined to her parents' home and is wearing a monitor, officials said. She will receive weekly visits from a case manager from the Orange County Corrections Department.

Anthony's 3-year-old daughter, Caylee, disappeared in mid-June, and her mother waited nearly a month before reporting the disappearance.

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Since then, evidence has mounted that Caylee is dead. Police have labeled the mother "a person of interest."

CNN law enforcement analyst Mike Brooks said that while it may appear that Anthony keeps going through a revolving jailhouse door, authorities would prefer she remain in custody.

"I think law enforcement would rather keep her in jail, putting pressure on her to break her," Brooks said.

Anthony initially explained that she didn't report her daughter missing because she was conducting her own investigation. Later, she told police she gave Caylee to a babysitter. But investigators soon learned that the address she gave them was an apartment that hadn't been occupied for months.

Brooks said that authorities may try again to jail Anthony as the forensic evidence continues to suggest a grim outcome.

"They may make another move to keep her behind bars," Brooks said. "The Anthonys keep saying they are looking for Caylee alive, but all the evidence points to not finding her alive, that she's deceased."

Authorities have not revealed who posted the bail, which allowed Anthony's release on the original charges -- child endangerment, obstructing an investigation and giving false statements to police. Watch Nancy Grace's take on the release »

Anthony also faces recently filed theft charges.

The story of Anthony and her missing daughter has garnered national headlines, been the nightly fodder of cable TV crime shows and brought a stampede of reporters to stake out the home of Anthony's parents. Watch fight break out outside parents' home »

As Anthony was arrested, bonded out of jail, was rearrested and bonded out again, investigators disclosed that they have uncovered some evidence in the case.

Authorities said they have found traces of chloroform in the car Anthony drove and Internet searches of chloroform Web sites on her computer.

Investigators said they had found evidence of human decomposition in the trunk of Anthony's car. Law enforcement sources also suggested that a strand of hair found in the trunk of the car was Caylee's.